The simple package

Simple is "framework-less" web framework for Haskell web applications
based on the WAI server interface (e.g. for use with the warp server).
Simple does not enforce a particular structure or paradigm for web
applications. Rather, Simple contains tools to help you create your own
patterns (or re-create existing ones). Simple is minimalist, providing a
lightweight base - the most basic Simple app is little more than a WAI
Application with some routing logic. Everything else (e.g. authentication,
controllers, persistence, caching etc') is provided in composable units, so
you can include only the ones you need in your app, and easily replace
with your own components.